Re: nat does not work with hvm

[Erdem Bayer <ebayer@ttnet.net.tr>]

Hi

I have been playing with the xen-unstable and observed that the vif-nat 
script is still running in the case of nat in qemu (although on the 
wrong interface as you have explained) Did I miss something or is it 
still running in the unstable vers. because it will have support on one 
of the next releases. Will nat be supported in qemu by xen in future 
versions or should I write my own qemu-ifup script? Also I was thinking 
if it is possible to have more than one qemu-ifup scripts and activate 
them from the config. Is this possible?

For the qemu-ifup script the steps I think is as follows:

1. Determine ip information.
2. Bring interface tap up with the ip
3. write iptables rules to route packages to the domU through tap 
interface ip

So the problem is passing the necessary values to qemu-ifup scripts. I 
wonder where qemu-ifup script is called. Is it possible to change its 
parameters?

Am I right? Do you have anything to add? If you can guide me through 
this I am sure I can come up with a reasonable script.

Thanks for help
Erdem

Keir Fraser wrote On 14-04-2007 13:19:
> On 14/4/07 08:12, "Erdem Bayer" <ebayer@ttnet.net.tr> wrote:
>
>   
>> Will the vif-nat script be run for the hvm domain? If not how does the
>> vifX.0 interface and route rules in my first config be created? I think
>> the the answer of this question is yes. Then what will the qemu-ifup
>> script do? What I wonder is what is the purpose of the qemu-ifup script
>> if the vif-nat script will be run also?
>>     
>
> Vif-nat isn't run in this case.
>
> Well actually it is run in 3.0.4 (but not in the very latest xen-unstable
> repository, so not in the forthcoming Xen 3.0.5). But it'll get run on the
> wrong interface. The vif2.0, or whatever, interfaces aren't used by qemu.
> qemu creates its own tap interface and the qemu-ifup script is executed to
> configure that tap interface.
>
>  -- Keir
>
>
>
>